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1 | /****************************************************************************** |
2 | * x86_emulate.c | |
3 | * | |
4 | * Generic x86 (32-bit and 64-bit) instruction decoder and emulator. | |
5 | * | |
6 | * Copyright (c) 2005 Keir Fraser | |
7 | * | |
8 | * Linux coding style, mod r/m decoder, segment base fixes, real-mode | |
dcc0766b | 9 | * privileged instructions: |
6aa8b732 AK |
10 | * |
11 | * Copyright (C) 2006 Qumranet | |
12 | * | |
13 | * Avi Kivity <avi@qumranet.com> | |
14 | * Yaniv Kamay <yaniv@qumranet.com> | |
15 | * | |
16 | * This work is licensed under the terms of the GNU GPL, version 2. See | |
17 | * the COPYING file in the top-level directory. | |
18 | * | |
19 | * From: xen-unstable 10676:af9809f51f81a3c43f276f00c81a52ef558afda4 | |
20 | */ | |
21 | ||
22 | #ifndef __KERNEL__ | |
23 | #include <stdio.h> | |
24 | #include <stdint.h> | |
25 | #include <public/xen.h> | |
26 | #define DPRINTF(_f, _a ...) printf( _f , ## _a ) | |
27 | #else | |
28 | #include "kvm.h" | |
29 | #define DPRINTF(x...) do {} while (0) | |
30 | #endif | |
31 | #include "x86_emulate.h" | |
32 | #include <linux/module.h> | |
33 | ||
34 | /* | |
35 | * Opcode effective-address decode tables. | |
36 | * Note that we only emulate instructions that have at least one memory | |
37 | * operand (excluding implicit stack references). We assume that stack | |
38 | * references and instruction fetches will never occur in special memory | |
39 | * areas that require emulation. So, for example, 'mov <imm>,<reg>' need | |
40 | * not be handled. | |
41 | */ | |
42 | ||
43 | /* Operand sizes: 8-bit operands or specified/overridden size. */ | |
44 | #define ByteOp (1<<0) /* 8-bit operands. */ | |
45 | /* Destination operand type. */ | |
46 | #define ImplicitOps (1<<1) /* Implicit in opcode. No generic decode. */ | |
47 | #define DstReg (2<<1) /* Register operand. */ | |
48 | #define DstMem (3<<1) /* Memory operand. */ | |
49 | #define DstMask (3<<1) | |
50 | /* Source operand type. */ | |
51 | #define SrcNone (0<<3) /* No source operand. */ | |
52 | #define SrcImplicit (0<<3) /* Source operand is implicit in the opcode. */ | |
53 | #define SrcReg (1<<3) /* Register operand. */ | |
54 | #define SrcMem (2<<3) /* Memory operand. */ | |
55 | #define SrcMem16 (3<<3) /* Memory operand (16-bit). */ | |
56 | #define SrcMem32 (4<<3) /* Memory operand (32-bit). */ | |
57 | #define SrcImm (5<<3) /* Immediate operand. */ | |
58 | #define SrcImmByte (6<<3) /* 8-bit sign-extended immediate operand. */ | |
59 | #define SrcMask (7<<3) | |
60 | /* Generic ModRM decode. */ | |
61 | #define ModRM (1<<6) | |
62 | /* Destination is only written; never read. */ | |
63 | #define Mov (1<<7) | |
038e51de | 64 | #define BitOp (1<<8) |
6aa8b732 AK |
65 | |
66 | static u8 opcode_table[256] = { | |
67 | /* 0x00 - 0x07 */ | |
68 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
69 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
70 | 0, 0, 0, 0, | |
71 | /* 0x08 - 0x0F */ | |
72 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
73 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
74 | 0, 0, 0, 0, | |
75 | /* 0x10 - 0x17 */ | |
76 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
77 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
78 | 0, 0, 0, 0, | |
79 | /* 0x18 - 0x1F */ | |
80 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
81 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
82 | 0, 0, 0, 0, | |
83 | /* 0x20 - 0x27 */ | |
84 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
85 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
19eb938e | 86 | SrcImmByte, SrcImm, 0, 0, |
6aa8b732 AK |
87 | /* 0x28 - 0x2F */ |
88 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
89 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
90 | 0, 0, 0, 0, | |
91 | /* 0x30 - 0x37 */ | |
92 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
93 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
94 | 0, 0, 0, 0, | |
95 | /* 0x38 - 0x3F */ | |
96 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
97 | ByteOp | DstReg | SrcMem | ModRM, DstReg | SrcMem | ModRM, | |
98 | 0, 0, 0, 0, | |
99 | /* 0x40 - 0x4F */ | |
100 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
7f0aaee0 | 101 | /* 0x50 - 0x57 */ |
7e778161 NK |
102 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, |
103 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
7f0aaee0 NK |
104 | /* 0x58 - 0x5F */ |
105 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
106 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
7d316911 | 107 | /* 0x60 - 0x67 */ |
6aa8b732 | 108 | 0, 0, 0, DstReg | SrcMem32 | ModRM | Mov /* movsxd (x86/64) */ , |
7d316911 NK |
109 | 0, 0, 0, 0, |
110 | /* 0x68 - 0x6F */ | |
111 | 0, 0, ImplicitOps|Mov, 0, | |
e70669ab LV |
112 | SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* insb, insw/insd */ |
113 | SrcNone | ByteOp | ImplicitOps, SrcNone | ImplicitOps, /* outsb, outsw/outsd */ | |
55bebde4 NK |
114 | /* 0x70 - 0x77 */ |
115 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
116 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
117 | /* 0x78 - 0x7F */ | |
118 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
119 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
6aa8b732 AK |
120 | /* 0x80 - 0x87 */ |
121 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImm | ModRM, | |
122 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, | |
123 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
124 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, | |
125 | /* 0x88 - 0x8F */ | |
126 | ByteOp | DstMem | SrcReg | ModRM | Mov, DstMem | SrcReg | ModRM | Mov, | |
127 | ByteOp | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
7e0b54b1 | 128 | 0, ModRM | DstReg, 0, DstMem | SrcNone | ModRM | Mov, |
6aa8b732 | 129 | /* 0x90 - 0x9F */ |
535eabcf | 130 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps, ImplicitOps, 0, 0, |
6aa8b732 AK |
131 | /* 0xA0 - 0xA7 */ |
132 | ByteOp | DstReg | SrcMem | Mov, DstReg | SrcMem | Mov, | |
133 | ByteOp | DstMem | SrcReg | Mov, DstMem | SrcReg | Mov, | |
134 | ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
135 | ByteOp | ImplicitOps, ImplicitOps, | |
136 | /* 0xA8 - 0xAF */ | |
137 | 0, 0, ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
138 | ByteOp | ImplicitOps | Mov, ImplicitOps | Mov, | |
139 | ByteOp | ImplicitOps, ImplicitOps, | |
140 | /* 0xB0 - 0xBF */ | |
141 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
142 | /* 0xC0 - 0xC7 */ | |
d9413cd7 NK |
143 | ByteOp | DstMem | SrcImm | ModRM, DstMem | SrcImmByte | ModRM, |
144 | 0, ImplicitOps, 0, 0, | |
145 | ByteOp | DstMem | SrcImm | ModRM | Mov, DstMem | SrcImm | ModRM | Mov, | |
6aa8b732 AK |
146 | /* 0xC8 - 0xCF */ |
147 | 0, 0, 0, 0, 0, 0, 0, 0, | |
148 | /* 0xD0 - 0xD7 */ | |
149 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
150 | ByteOp | DstMem | SrcImplicit | ModRM, DstMem | SrcImplicit | ModRM, | |
151 | 0, 0, 0, 0, | |
152 | /* 0xD8 - 0xDF */ | |
153 | 0, 0, 0, 0, 0, 0, 0, 0, | |
098c937b NK |
154 | /* 0xE0 - 0xE7 */ |
155 | 0, 0, 0, 0, 0, 0, 0, 0, | |
156 | /* 0xE8 - 0xEF */ | |
f6eed391 | 157 | ImplicitOps, SrcImm|ImplicitOps, 0, SrcImmByte|ImplicitOps, 0, 0, 0, 0, |
6aa8b732 AK |
158 | /* 0xF0 - 0xF7 */ |
159 | 0, 0, 0, 0, | |
72d6e5a0 AK |
160 | ImplicitOps, 0, |
161 | ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM, | |
6aa8b732 AK |
162 | /* 0xF8 - 0xFF */ |
163 | 0, 0, 0, 0, | |
164 | 0, 0, ByteOp | DstMem | SrcNone | ModRM, DstMem | SrcNone | ModRM | |
165 | }; | |
166 | ||
038e51de | 167 | static u16 twobyte_table[256] = { |
6aa8b732 AK |
168 | /* 0x00 - 0x0F */ |
169 | 0, SrcMem | ModRM | DstReg, 0, 0, 0, 0, ImplicitOps, 0, | |
651a3e29 | 170 | ImplicitOps, ImplicitOps, 0, 0, 0, ImplicitOps | ModRM, 0, 0, |
6aa8b732 AK |
171 | /* 0x10 - 0x1F */ |
172 | 0, 0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, | |
173 | /* 0x20 - 0x2F */ | |
174 | ModRM | ImplicitOps, ModRM, ModRM | ImplicitOps, ModRM, 0, 0, 0, 0, | |
175 | 0, 0, 0, 0, 0, 0, 0, 0, | |
176 | /* 0x30 - 0x3F */ | |
35f3f286 | 177 | ImplicitOps, 0, ImplicitOps, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
6aa8b732 AK |
178 | /* 0x40 - 0x47 */ |
179 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
180 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
181 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
182 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
183 | /* 0x48 - 0x4F */ | |
184 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
185 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
186 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
187 | DstReg | SrcMem | ModRM | Mov, DstReg | SrcMem | ModRM | Mov, | |
188 | /* 0x50 - 0x5F */ | |
189 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
190 | /* 0x60 - 0x6F */ | |
191 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
192 | /* 0x70 - 0x7F */ | |
193 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
194 | /* 0x80 - 0x8F */ | |
bbe9abbd NK |
195 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, |
196 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
197 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
198 | ImplicitOps, ImplicitOps, ImplicitOps, ImplicitOps, | |
6aa8b732 AK |
199 | /* 0x90 - 0x9F */ |
200 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
201 | /* 0xA0 - 0xA7 */ | |
038e51de | 202 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 | 203 | /* 0xA8 - 0xAF */ |
038e51de | 204 | 0, 0, 0, DstMem | SrcReg | ModRM | BitOp, 0, 0, 0, 0, |
6aa8b732 AK |
205 | /* 0xB0 - 0xB7 */ |
206 | ByteOp | DstMem | SrcReg | ModRM, DstMem | SrcReg | ModRM, 0, | |
038e51de | 207 | DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
208 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
209 | DstReg | SrcMem16 | ModRM | Mov, | |
210 | /* 0xB8 - 0xBF */ | |
038e51de | 211 | 0, 0, DstMem | SrcImmByte | ModRM, DstMem | SrcReg | ModRM | BitOp, |
6aa8b732 AK |
212 | 0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov, |
213 | DstReg | SrcMem16 | ModRM | Mov, | |
214 | /* 0xC0 - 0xCF */ | |
a012e65a SY |
215 | 0, 0, 0, DstMem | SrcReg | ModRM | Mov, 0, 0, 0, ImplicitOps | ModRM, |
216 | 0, 0, 0, 0, 0, 0, 0, 0, | |
6aa8b732 AK |
217 | /* 0xD0 - 0xDF */ |
218 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
219 | /* 0xE0 - 0xEF */ | |
220 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
221 | /* 0xF0 - 0xFF */ | |
222 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 | |
223 | }; | |
224 | ||
6aa8b732 AK |
225 | /* EFLAGS bit definitions. */ |
226 | #define EFLG_OF (1<<11) | |
227 | #define EFLG_DF (1<<10) | |
228 | #define EFLG_SF (1<<7) | |
229 | #define EFLG_ZF (1<<6) | |
230 | #define EFLG_AF (1<<4) | |
231 | #define EFLG_PF (1<<2) | |
232 | #define EFLG_CF (1<<0) | |
233 | ||
234 | /* | |
235 | * Instruction emulation: | |
236 | * Most instructions are emulated directly via a fragment of inline assembly | |
237 | * code. This allows us to save/restore EFLAGS and thus very easily pick up | |
238 | * any modified flags. | |
239 | */ | |
240 | ||
05b3e0c2 | 241 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
242 | #define _LO32 "k" /* force 32-bit operand */ |
243 | #define _STK "%%rsp" /* stack pointer */ | |
244 | #elif defined(__i386__) | |
245 | #define _LO32 "" /* force 32-bit operand */ | |
246 | #define _STK "%%esp" /* stack pointer */ | |
247 | #endif | |
248 | ||
249 | /* | |
250 | * These EFLAGS bits are restored from saved value during emulation, and | |
251 | * any changes are written back to the saved value after emulation. | |
252 | */ | |
253 | #define EFLAGS_MASK (EFLG_OF|EFLG_SF|EFLG_ZF|EFLG_AF|EFLG_PF|EFLG_CF) | |
254 | ||
255 | /* Before executing instruction: restore necessary bits in EFLAGS. */ | |
256 | #define _PRE_EFLAGS(_sav, _msk, _tmp) \ | |
257 | /* EFLAGS = (_sav & _msk) | (EFLAGS & ~_msk); */ \ | |
258 | "push %"_sav"; " \ | |
259 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
260 | "andl %"_LO32 _tmp",("_STK"); " \ | |
261 | "pushf; " \ | |
262 | "notl %"_LO32 _tmp"; " \ | |
263 | "andl %"_LO32 _tmp",("_STK"); " \ | |
264 | "pop %"_tmp"; " \ | |
265 | "orl %"_LO32 _tmp",("_STK"); " \ | |
266 | "popf; " \ | |
267 | /* _sav &= ~msk; */ \ | |
268 | "movl %"_msk",%"_LO32 _tmp"; " \ | |
269 | "notl %"_LO32 _tmp"; " \ | |
270 | "andl %"_LO32 _tmp",%"_sav"; " | |
271 | ||
272 | /* After executing instruction: write-back necessary bits in EFLAGS. */ | |
273 | #define _POST_EFLAGS(_sav, _msk, _tmp) \ | |
274 | /* _sav |= EFLAGS & _msk; */ \ | |
275 | "pushf; " \ | |
276 | "pop %"_tmp"; " \ | |
277 | "andl %"_msk",%"_LO32 _tmp"; " \ | |
278 | "orl %"_LO32 _tmp",%"_sav"; " | |
279 | ||
280 | /* Raw emulation: instruction has two explicit operands. */ | |
281 | #define __emulate_2op_nobyte(_op,_src,_dst,_eflags,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
282 | do { \ | |
283 | unsigned long _tmp; \ | |
284 | \ | |
285 | switch ((_dst).bytes) { \ | |
286 | case 2: \ | |
287 | __asm__ __volatile__ ( \ | |
288 | _PRE_EFLAGS("0","4","2") \ | |
289 | _op"w %"_wx"3,%1; " \ | |
290 | _POST_EFLAGS("0","4","2") \ | |
291 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
292 | "=&r" (_tmp) \ | |
293 | : _wy ((_src).val), "i" (EFLAGS_MASK) ); \ | |
294 | break; \ | |
295 | case 4: \ | |
296 | __asm__ __volatile__ ( \ | |
297 | _PRE_EFLAGS("0","4","2") \ | |
298 | _op"l %"_lx"3,%1; " \ | |
299 | _POST_EFLAGS("0","4","2") \ | |
300 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
301 | "=&r" (_tmp) \ | |
302 | : _ly ((_src).val), "i" (EFLAGS_MASK) ); \ | |
303 | break; \ | |
304 | case 8: \ | |
305 | __emulate_2op_8byte(_op, _src, _dst, \ | |
306 | _eflags, _qx, _qy); \ | |
307 | break; \ | |
308 | } \ | |
309 | } while (0) | |
310 | ||
311 | #define __emulate_2op(_op,_src,_dst,_eflags,_bx,_by,_wx,_wy,_lx,_ly,_qx,_qy) \ | |
312 | do { \ | |
313 | unsigned long _tmp; \ | |
314 | switch ( (_dst).bytes ) \ | |
315 | { \ | |
316 | case 1: \ | |
317 | __asm__ __volatile__ ( \ | |
318 | _PRE_EFLAGS("0","4","2") \ | |
319 | _op"b %"_bx"3,%1; " \ | |
320 | _POST_EFLAGS("0","4","2") \ | |
321 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
322 | "=&r" (_tmp) \ | |
323 | : _by ((_src).val), "i" (EFLAGS_MASK) ); \ | |
324 | break; \ | |
325 | default: \ | |
326 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
327 | _wx, _wy, _lx, _ly, _qx, _qy); \ | |
328 | break; \ | |
329 | } \ | |
330 | } while (0) | |
331 | ||
332 | /* Source operand is byte-sized and may be restricted to just %cl. */ | |
333 | #define emulate_2op_SrcB(_op, _src, _dst, _eflags) \ | |
334 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
335 | "b", "c", "b", "c", "b", "c", "b", "c") | |
336 | ||
337 | /* Source operand is byte, word, long or quad sized. */ | |
338 | #define emulate_2op_SrcV(_op, _src, _dst, _eflags) \ | |
339 | __emulate_2op(_op, _src, _dst, _eflags, \ | |
340 | "b", "q", "w", "r", _LO32, "r", "", "r") | |
341 | ||
342 | /* Source operand is word, long or quad sized. */ | |
343 | #define emulate_2op_SrcV_nobyte(_op, _src, _dst, _eflags) \ | |
344 | __emulate_2op_nobyte(_op, _src, _dst, _eflags, \ | |
345 | "w", "r", _LO32, "r", "", "r") | |
346 | ||
347 | /* Instruction has only one explicit operand (no source operand). */ | |
348 | #define emulate_1op(_op, _dst, _eflags) \ | |
349 | do { \ | |
350 | unsigned long _tmp; \ | |
351 | \ | |
352 | switch ( (_dst).bytes ) \ | |
353 | { \ | |
354 | case 1: \ | |
355 | __asm__ __volatile__ ( \ | |
356 | _PRE_EFLAGS("0","3","2") \ | |
357 | _op"b %1; " \ | |
358 | _POST_EFLAGS("0","3","2") \ | |
359 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
360 | "=&r" (_tmp) \ | |
361 | : "i" (EFLAGS_MASK) ); \ | |
362 | break; \ | |
363 | case 2: \ | |
364 | __asm__ __volatile__ ( \ | |
365 | _PRE_EFLAGS("0","3","2") \ | |
366 | _op"w %1; " \ | |
367 | _POST_EFLAGS("0","3","2") \ | |
368 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
369 | "=&r" (_tmp) \ | |
370 | : "i" (EFLAGS_MASK) ); \ | |
371 | break; \ | |
372 | case 4: \ | |
373 | __asm__ __volatile__ ( \ | |
374 | _PRE_EFLAGS("0","3","2") \ | |
375 | _op"l %1; " \ | |
376 | _POST_EFLAGS("0","3","2") \ | |
377 | : "=m" (_eflags), "=m" ((_dst).val), \ | |
378 | "=&r" (_tmp) \ | |
379 | : "i" (EFLAGS_MASK) ); \ | |
380 | break; \ | |
381 | case 8: \ | |
382 | __emulate_1op_8byte(_op, _dst, _eflags); \ | |
383 | break; \ | |
384 | } \ | |
385 | } while (0) | |
386 | ||
387 | /* Emulate an instruction with quadword operands (x86/64 only). */ | |
05b3e0c2 | 388 | #if defined(CONFIG_X86_64) |
6aa8b732 AK |
389 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) \ |
390 | do { \ | |
391 | __asm__ __volatile__ ( \ | |
392 | _PRE_EFLAGS("0","4","2") \ | |
393 | _op"q %"_qx"3,%1; " \ | |
394 | _POST_EFLAGS("0","4","2") \ | |
395 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ | |
396 | : _qy ((_src).val), "i" (EFLAGS_MASK) ); \ | |
397 | } while (0) | |
398 | ||
399 | #define __emulate_1op_8byte(_op, _dst, _eflags) \ | |
400 | do { \ | |
401 | __asm__ __volatile__ ( \ | |
402 | _PRE_EFLAGS("0","3","2") \ | |
403 | _op"q %1; " \ | |
404 | _POST_EFLAGS("0","3","2") \ | |
405 | : "=m" (_eflags), "=m" ((_dst).val), "=&r" (_tmp) \ | |
406 | : "i" (EFLAGS_MASK) ); \ | |
407 | } while (0) | |
408 | ||
409 | #elif defined(__i386__) | |
410 | #define __emulate_2op_8byte(_op, _src, _dst, _eflags, _qx, _qy) | |
411 | #define __emulate_1op_8byte(_op, _dst, _eflags) | |
412 | #endif /* __i386__ */ | |
413 | ||
414 | /* Fetch next part of the instruction being emulated. */ | |
415 | #define insn_fetch(_type, _size, _eip) \ | |
416 | ({ unsigned long _x; \ | |
417 | rc = ops->read_std((unsigned long)(_eip) + ctxt->cs_base, &_x, \ | |
cebff02b | 418 | (_size), ctxt->vcpu); \ |
6aa8b732 AK |
419 | if ( rc != 0 ) \ |
420 | goto done; \ | |
421 | (_eip) += (_size); \ | |
422 | (_type)_x; \ | |
423 | }) | |
424 | ||
425 | /* Access/update address held in a register, based on addressing mode. */ | |
e70669ab | 426 | #define address_mask(reg) \ |
e4e03ded LV |
427 | ((c->ad_bytes == sizeof(unsigned long)) ? \ |
428 | (reg) : ((reg) & ((1UL << (c->ad_bytes << 3)) - 1))) | |
6aa8b732 | 429 | #define register_address(base, reg) \ |
e70669ab | 430 | ((base) + address_mask(reg)) |
6aa8b732 AK |
431 | #define register_address_increment(reg, inc) \ |
432 | do { \ | |
433 | /* signed type ensures sign extension to long */ \ | |
434 | int _inc = (inc); \ | |
e4e03ded | 435 | if (c->ad_bytes == sizeof(unsigned long)) \ |
6aa8b732 AK |
436 | (reg) += _inc; \ |
437 | else \ | |
e4e03ded LV |
438 | (reg) = ((reg) & \ |
439 | ~((1UL << (c->ad_bytes << 3)) - 1)) | \ | |
440 | (((reg) + _inc) & \ | |
441 | ((1UL << (c->ad_bytes << 3)) - 1)); \ | |
6aa8b732 AK |
442 | } while (0) |
443 | ||
098c937b NK |
444 | #define JMP_REL(rel) \ |
445 | do { \ | |
e4e03ded | 446 | register_address_increment(c->eip, rel); \ |
098c937b NK |
447 | } while (0) |
448 | ||
1e3c5cb0 RR |
449 | /* |
450 | * Given the 'reg' portion of a ModRM byte, and a register block, return a | |
451 | * pointer into the block that addresses the relevant register. | |
452 | * @highbyte_regs specifies whether to decode AH,CH,DH,BH. | |
453 | */ | |
454 | static void *decode_register(u8 modrm_reg, unsigned long *regs, | |
455 | int highbyte_regs) | |
6aa8b732 AK |
456 | { |
457 | void *p; | |
458 | ||
459 | p = ®s[modrm_reg]; | |
460 | if (highbyte_regs && modrm_reg >= 4 && modrm_reg < 8) | |
461 | p = (unsigned char *)®s[modrm_reg & 3] + 1; | |
462 | return p; | |
463 | } | |
464 | ||
465 | static int read_descriptor(struct x86_emulate_ctxt *ctxt, | |
466 | struct x86_emulate_ops *ops, | |
467 | void *ptr, | |
468 | u16 *size, unsigned long *address, int op_bytes) | |
469 | { | |
470 | int rc; | |
471 | ||
472 | if (op_bytes == 2) | |
473 | op_bytes = 3; | |
474 | *address = 0; | |
cebff02b LV |
475 | rc = ops->read_std((unsigned long)ptr, (unsigned long *)size, 2, |
476 | ctxt->vcpu); | |
6aa8b732 AK |
477 | if (rc) |
478 | return rc; | |
cebff02b LV |
479 | rc = ops->read_std((unsigned long)ptr + 2, address, op_bytes, |
480 | ctxt->vcpu); | |
6aa8b732 AK |
481 | return rc; |
482 | } | |
483 | ||
bbe9abbd NK |
484 | static int test_cc(unsigned int condition, unsigned int flags) |
485 | { | |
486 | int rc = 0; | |
487 | ||
488 | switch ((condition & 15) >> 1) { | |
489 | case 0: /* o */ | |
490 | rc |= (flags & EFLG_OF); | |
491 | break; | |
492 | case 1: /* b/c/nae */ | |
493 | rc |= (flags & EFLG_CF); | |
494 | break; | |
495 | case 2: /* z/e */ | |
496 | rc |= (flags & EFLG_ZF); | |
497 | break; | |
498 | case 3: /* be/na */ | |
499 | rc |= (flags & (EFLG_CF|EFLG_ZF)); | |
500 | break; | |
501 | case 4: /* s */ | |
502 | rc |= (flags & EFLG_SF); | |
503 | break; | |
504 | case 5: /* p/pe */ | |
505 | rc |= (flags & EFLG_PF); | |
506 | break; | |
507 | case 7: /* le/ng */ | |
508 | rc |= (flags & EFLG_ZF); | |
509 | /* fall through */ | |
510 | case 6: /* l/nge */ | |
511 | rc |= (!(flags & EFLG_SF) != !(flags & EFLG_OF)); | |
512 | break; | |
513 | } | |
514 | ||
515 | /* Odd condition identifiers (lsb == 1) have inverted sense. */ | |
516 | return (!!rc ^ (condition & 1)); | |
517 | } | |
518 | ||
6aa8b732 | 519 | int |
8b4caf66 | 520 | x86_decode_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
6aa8b732 | 521 | { |
e4e03ded LV |
522 | struct decode_cache *c = &ctxt->decode; |
523 | u8 sib, rex_prefix = 0; | |
524 | unsigned int i; | |
6aa8b732 | 525 | int rc = 0; |
6aa8b732 | 526 | int mode = ctxt->mode; |
e4e03ded | 527 | int index_reg = 0, base_reg = 0, scale, rip_relative = 0; |
6aa8b732 AK |
528 | |
529 | /* Shadow copy of register state. Committed on successful emulation. */ | |
6aa8b732 | 530 | |
e4e03ded LV |
531 | memset(c, 0, sizeof(struct decode_cache)); |
532 | c->eip = ctxt->vcpu->rip; | |
533 | memcpy(c->regs, ctxt->vcpu->regs, sizeof c->regs); | |
6aa8b732 AK |
534 | |
535 | switch (mode) { | |
536 | case X86EMUL_MODE_REAL: | |
537 | case X86EMUL_MODE_PROT16: | |
e4e03ded | 538 | c->op_bytes = c->ad_bytes = 2; |
6aa8b732 AK |
539 | break; |
540 | case X86EMUL_MODE_PROT32: | |
e4e03ded | 541 | c->op_bytes = c->ad_bytes = 4; |
6aa8b732 | 542 | break; |
05b3e0c2 | 543 | #ifdef CONFIG_X86_64 |
6aa8b732 | 544 | case X86EMUL_MODE_PROT64: |
e4e03ded LV |
545 | c->op_bytes = 4; |
546 | c->ad_bytes = 8; | |
6aa8b732 AK |
547 | break; |
548 | #endif | |
549 | default: | |
550 | return -1; | |
551 | } | |
552 | ||
553 | /* Legacy prefixes. */ | |
554 | for (i = 0; i < 8; i++) { | |
e4e03ded | 555 | switch (c->b = insn_fetch(u8, 1, c->eip)) { |
6aa8b732 | 556 | case 0x66: /* operand-size override */ |
e4e03ded | 557 | c->op_bytes ^= 6; /* switch between 2/4 bytes */ |
6aa8b732 AK |
558 | break; |
559 | case 0x67: /* address-size override */ | |
560 | if (mode == X86EMUL_MODE_PROT64) | |
e4e03ded LV |
561 | /* switch between 4/8 bytes */ |
562 | c->ad_bytes ^= 12; | |
6aa8b732 | 563 | else |
e4e03ded LV |
564 | /* switch between 2/4 bytes */ |
565 | c->ad_bytes ^= 6; | |
6aa8b732 AK |
566 | break; |
567 | case 0x2e: /* CS override */ | |
e4e03ded | 568 | c->override_base = &ctxt->cs_base; |
6aa8b732 AK |
569 | break; |
570 | case 0x3e: /* DS override */ | |
e4e03ded | 571 | c->override_base = &ctxt->ds_base; |
6aa8b732 AK |
572 | break; |
573 | case 0x26: /* ES override */ | |
e4e03ded | 574 | c->override_base = &ctxt->es_base; |
6aa8b732 AK |
575 | break; |
576 | case 0x64: /* FS override */ | |
e4e03ded | 577 | c->override_base = &ctxt->fs_base; |
6aa8b732 AK |
578 | break; |
579 | case 0x65: /* GS override */ | |
e4e03ded | 580 | c->override_base = &ctxt->gs_base; |
6aa8b732 AK |
581 | break; |
582 | case 0x36: /* SS override */ | |
e4e03ded | 583 | c->override_base = &ctxt->ss_base; |
6aa8b732 AK |
584 | break; |
585 | case 0xf0: /* LOCK */ | |
e4e03ded | 586 | c->lock_prefix = 1; |
6aa8b732 | 587 | break; |
ae6200ba | 588 | case 0xf2: /* REPNE/REPNZ */ |
6aa8b732 | 589 | case 0xf3: /* REP/REPE/REPZ */ |
e4e03ded | 590 | c->rep_prefix = 1; |
6aa8b732 | 591 | break; |
6aa8b732 AK |
592 | default: |
593 | goto done_prefixes; | |
594 | } | |
595 | } | |
596 | ||
597 | done_prefixes: | |
598 | ||
599 | /* REX prefix. */ | |
e4e03ded LV |
600 | if ((mode == X86EMUL_MODE_PROT64) && ((c->b & 0xf0) == 0x40)) { |
601 | rex_prefix = c->b; | |
602 | if (c->b & 8) | |
603 | c->op_bytes = 8; /* REX.W */ | |
604 | c->modrm_reg = (c->b & 4) << 1; /* REX.R */ | |
605 | index_reg = (c->b & 2) << 2; /* REX.X */ | |
606 | c->modrm_rm = base_reg = (c->b & 1) << 3; /* REG.B */ | |
607 | c->b = insn_fetch(u8, 1, c->eip); | |
6aa8b732 AK |
608 | } |
609 | ||
610 | /* Opcode byte(s). */ | |
e4e03ded LV |
611 | c->d = opcode_table[c->b]; |
612 | if (c->d == 0) { | |
6aa8b732 | 613 | /* Two-byte opcode? */ |
e4e03ded LV |
614 | if (c->b == 0x0f) { |
615 | c->twobyte = 1; | |
616 | c->b = insn_fetch(u8, 1, c->eip); | |
617 | c->d = twobyte_table[c->b]; | |
6aa8b732 AK |
618 | } |
619 | ||
620 | /* Unrecognised? */ | |
8b4caf66 LV |
621 | if (c->d == 0) { |
622 | DPRINTF("Cannot emulate %02x\n", c->b); | |
623 | return -1; | |
624 | } | |
6aa8b732 AK |
625 | } |
626 | ||
627 | /* ModRM and SIB bytes. */ | |
e4e03ded LV |
628 | if (c->d & ModRM) { |
629 | c->modrm = insn_fetch(u8, 1, c->eip); | |
630 | c->modrm_mod |= (c->modrm & 0xc0) >> 6; | |
631 | c->modrm_reg |= (c->modrm & 0x38) >> 3; | |
632 | c->modrm_rm |= (c->modrm & 0x07); | |
633 | c->modrm_ea = 0; | |
634 | c->use_modrm_ea = 1; | |
635 | ||
636 | if (c->modrm_mod == 3) { | |
637 | c->modrm_val = *(unsigned long *) | |
638 | decode_register(c->modrm_rm, c->regs, c->d & ByteOp); | |
6aa8b732 AK |
639 | goto modrm_done; |
640 | } | |
641 | ||
e4e03ded LV |
642 | if (c->ad_bytes == 2) { |
643 | unsigned bx = c->regs[VCPU_REGS_RBX]; | |
644 | unsigned bp = c->regs[VCPU_REGS_RBP]; | |
645 | unsigned si = c->regs[VCPU_REGS_RSI]; | |
646 | unsigned di = c->regs[VCPU_REGS_RDI]; | |
6aa8b732 AK |
647 | |
648 | /* 16-bit ModR/M decode. */ | |
e4e03ded | 649 | switch (c->modrm_mod) { |
6aa8b732 | 650 | case 0: |
e4e03ded LV |
651 | if (c->modrm_rm == 6) |
652 | c->modrm_ea += | |
653 | insn_fetch(u16, 2, c->eip); | |
6aa8b732 AK |
654 | break; |
655 | case 1: | |
e4e03ded | 656 | c->modrm_ea += insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
657 | break; |
658 | case 2: | |
e4e03ded | 659 | c->modrm_ea += insn_fetch(u16, 2, c->eip); |
6aa8b732 AK |
660 | break; |
661 | } | |
e4e03ded | 662 | switch (c->modrm_rm) { |
6aa8b732 | 663 | case 0: |
e4e03ded | 664 | c->modrm_ea += bx + si; |
6aa8b732 AK |
665 | break; |
666 | case 1: | |
e4e03ded | 667 | c->modrm_ea += bx + di; |
6aa8b732 AK |
668 | break; |
669 | case 2: | |
e4e03ded | 670 | c->modrm_ea += bp + si; |
6aa8b732 AK |
671 | break; |
672 | case 3: | |
e4e03ded | 673 | c->modrm_ea += bp + di; |
6aa8b732 AK |
674 | break; |
675 | case 4: | |
e4e03ded | 676 | c->modrm_ea += si; |
6aa8b732 AK |
677 | break; |
678 | case 5: | |
e4e03ded | 679 | c->modrm_ea += di; |
6aa8b732 AK |
680 | break; |
681 | case 6: | |
e4e03ded LV |
682 | if (c->modrm_mod != 0) |
683 | c->modrm_ea += bp; | |
6aa8b732 AK |
684 | break; |
685 | case 7: | |
e4e03ded | 686 | c->modrm_ea += bx; |
6aa8b732 AK |
687 | break; |
688 | } | |
e4e03ded LV |
689 | if (c->modrm_rm == 2 || c->modrm_rm == 3 || |
690 | (c->modrm_rm == 6 && c->modrm_mod != 0)) | |
691 | if (!c->override_base) | |
692 | c->override_base = &ctxt->ss_base; | |
693 | c->modrm_ea = (u16)c->modrm_ea; | |
6aa8b732 AK |
694 | } else { |
695 | /* 32/64-bit ModR/M decode. */ | |
e4e03ded | 696 | switch (c->modrm_rm) { |
6aa8b732 AK |
697 | case 4: |
698 | case 12: | |
e4e03ded | 699 | sib = insn_fetch(u8, 1, c->eip); |
6aa8b732 AK |
700 | index_reg |= (sib >> 3) & 7; |
701 | base_reg |= sib & 7; | |
702 | scale = sib >> 6; | |
703 | ||
704 | switch (base_reg) { | |
705 | case 5: | |
e4e03ded LV |
706 | if (c->modrm_mod != 0) |
707 | c->modrm_ea += | |
708 | c->regs[base_reg]; | |
6aa8b732 | 709 | else |
e4e03ded LV |
710 | c->modrm_ea += |
711 | insn_fetch(s32, 4, c->eip); | |
6aa8b732 AK |
712 | break; |
713 | default: | |
e4e03ded | 714 | c->modrm_ea += c->regs[base_reg]; |
6aa8b732 AK |
715 | } |
716 | switch (index_reg) { | |
717 | case 4: | |
718 | break; | |
719 | default: | |
e4e03ded LV |
720 | c->modrm_ea += |
721 | c->regs[index_reg] << scale; | |
6aa8b732 AK |
722 | |
723 | } | |
724 | break; | |
725 | case 5: | |
e4e03ded LV |
726 | if (c->modrm_mod != 0) |
727 | c->modrm_ea += c->regs[c->modrm_rm]; | |
6aa8b732 AK |
728 | else if (mode == X86EMUL_MODE_PROT64) |
729 | rip_relative = 1; | |
730 | break; | |
731 | default: | |
e4e03ded | 732 | c->modrm_ea += c->regs[c->modrm_rm]; |
6aa8b732 AK |
733 | break; |
734 | } | |
e4e03ded | 735 | switch (c->modrm_mod) { |
6aa8b732 | 736 | case 0: |
e4e03ded LV |
737 | if (c->modrm_rm == 5) |
738 | c->modrm_ea += | |
739 | insn_fetch(s32, 4, c->eip); | |
6aa8b732 AK |
740 | break; |
741 | case 1: | |
e4e03ded | 742 | c->modrm_ea += insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
743 | break; |
744 | case 2: | |
e4e03ded | 745 | c->modrm_ea += insn_fetch(s32, 4, c->eip); |
6aa8b732 AK |
746 | break; |
747 | } | |
748 | } | |
e4e03ded LV |
749 | if (!c->override_base) |
750 | c->override_base = &ctxt->ds_base; | |
6aa8b732 | 751 | if (mode == X86EMUL_MODE_PROT64 && |
e4e03ded LV |
752 | c->override_base != &ctxt->fs_base && |
753 | c->override_base != &ctxt->gs_base) | |
754 | c->override_base = NULL; | |
6aa8b732 | 755 | |
e4e03ded LV |
756 | if (c->override_base) |
757 | c->modrm_ea += *c->override_base; | |
6aa8b732 AK |
758 | |
759 | if (rip_relative) { | |
e4e03ded LV |
760 | c->modrm_ea += c->eip; |
761 | switch (c->d & SrcMask) { | |
6aa8b732 | 762 | case SrcImmByte: |
e4e03ded | 763 | c->modrm_ea += 1; |
6aa8b732 AK |
764 | break; |
765 | case SrcImm: | |
e4e03ded LV |
766 | if (c->d & ByteOp) |
767 | c->modrm_ea += 1; | |
6aa8b732 | 768 | else |
e4e03ded LV |
769 | if (c->op_bytes == 8) |
770 | c->modrm_ea += 4; | |
6aa8b732 | 771 | else |
e4e03ded | 772 | c->modrm_ea += c->op_bytes; |
6aa8b732 AK |
773 | } |
774 | } | |
e4e03ded LV |
775 | if (c->ad_bytes != 8) |
776 | c->modrm_ea = (u32)c->modrm_ea; | |
6aa8b732 AK |
777 | modrm_done: |
778 | ; | |
779 | } | |
780 | ||
6aa8b732 AK |
781 | /* |
782 | * Decode and fetch the source operand: register, memory | |
783 | * or immediate. | |
784 | */ | |
e4e03ded | 785 | switch (c->d & SrcMask) { |
6aa8b732 AK |
786 | case SrcNone: |
787 | break; | |
788 | case SrcReg: | |
e4e03ded LV |
789 | c->src.type = OP_REG; |
790 | if (c->d & ByteOp) { | |
791 | c->src.ptr = | |
792 | decode_register(c->modrm_reg, c->regs, | |
6aa8b732 | 793 | (rex_prefix == 0)); |
e4e03ded LV |
794 | c->src.val = c->src.orig_val = *(u8 *)c->src.ptr; |
795 | c->src.bytes = 1; | |
6aa8b732 | 796 | } else { |
e4e03ded LV |
797 | c->src.ptr = |
798 | decode_register(c->modrm_reg, c->regs, 0); | |
799 | switch ((c->src.bytes = c->op_bytes)) { | |
6aa8b732 | 800 | case 2: |
e4e03ded LV |
801 | c->src.val = c->src.orig_val = |
802 | *(u16 *) c->src.ptr; | |
6aa8b732 AK |
803 | break; |
804 | case 4: | |
e4e03ded LV |
805 | c->src.val = c->src.orig_val = |
806 | *(u32 *) c->src.ptr; | |
6aa8b732 AK |
807 | break; |
808 | case 8: | |
e4e03ded LV |
809 | c->src.val = c->src.orig_val = |
810 | *(u64 *) c->src.ptr; | |
6aa8b732 AK |
811 | break; |
812 | } | |
813 | } | |
814 | break; | |
815 | case SrcMem16: | |
e4e03ded | 816 | c->src.bytes = 2; |
6aa8b732 AK |
817 | goto srcmem_common; |
818 | case SrcMem32: | |
e4e03ded | 819 | c->src.bytes = 4; |
6aa8b732 AK |
820 | goto srcmem_common; |
821 | case SrcMem: | |
e4e03ded LV |
822 | c->src.bytes = (c->d & ByteOp) ? 1 : |
823 | c->op_bytes; | |
b85b9ee9 | 824 | /* Don't fetch the address for invlpg: it could be unmapped. */ |
e4e03ded LV |
825 | if (c->twobyte && c->b == 0x01 |
826 | && c->modrm_reg == 7) | |
b85b9ee9 | 827 | break; |
6aa8b732 | 828 | srcmem_common: |
4e62417b AJ |
829 | /* |
830 | * For instructions with a ModR/M byte, switch to register | |
831 | * access if Mod = 3. | |
832 | */ | |
e4e03ded LV |
833 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
834 | c->src.type = OP_REG; | |
4e62417b AJ |
835 | break; |
836 | } | |
e4e03ded | 837 | c->src.type = OP_MEM; |
6aa8b732 AK |
838 | break; |
839 | case SrcImm: | |
e4e03ded LV |
840 | c->src.type = OP_IMM; |
841 | c->src.ptr = (unsigned long *)c->eip; | |
842 | c->src.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
843 | if (c->src.bytes == 8) | |
844 | c->src.bytes = 4; | |
6aa8b732 | 845 | /* NB. Immediates are sign-extended as necessary. */ |
e4e03ded | 846 | switch (c->src.bytes) { |
6aa8b732 | 847 | case 1: |
e4e03ded | 848 | c->src.val = insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
849 | break; |
850 | case 2: | |
e4e03ded | 851 | c->src.val = insn_fetch(s16, 2, c->eip); |
6aa8b732 AK |
852 | break; |
853 | case 4: | |
e4e03ded | 854 | c->src.val = insn_fetch(s32, 4, c->eip); |
6aa8b732 AK |
855 | break; |
856 | } | |
857 | break; | |
858 | case SrcImmByte: | |
e4e03ded LV |
859 | c->src.type = OP_IMM; |
860 | c->src.ptr = (unsigned long *)c->eip; | |
861 | c->src.bytes = 1; | |
862 | c->src.val = insn_fetch(s8, 1, c->eip); | |
6aa8b732 AK |
863 | break; |
864 | } | |
865 | ||
038e51de | 866 | /* Decode and fetch the destination operand: register or memory. */ |
e4e03ded | 867 | switch (c->d & DstMask) { |
038e51de AK |
868 | case ImplicitOps: |
869 | /* Special instructions do their own operand decoding. */ | |
8b4caf66 | 870 | return 0; |
038e51de | 871 | case DstReg: |
e4e03ded LV |
872 | c->dst.type = OP_REG; |
873 | if ((c->d & ByteOp) | |
874 | && !(c->twobyte && | |
875 | (c->b == 0xb6 || c->b == 0xb7))) { | |
876 | c->dst.ptr = | |
877 | decode_register(c->modrm_reg, c->regs, | |
038e51de | 878 | (rex_prefix == 0)); |
e4e03ded LV |
879 | c->dst.val = *(u8 *) c->dst.ptr; |
880 | c->dst.bytes = 1; | |
038e51de | 881 | } else { |
e4e03ded LV |
882 | c->dst.ptr = |
883 | decode_register(c->modrm_reg, c->regs, 0); | |
884 | switch ((c->dst.bytes = c->op_bytes)) { | |
038e51de | 885 | case 2: |
e4e03ded | 886 | c->dst.val = *(u16 *)c->dst.ptr; |
038e51de AK |
887 | break; |
888 | case 4: | |
e4e03ded | 889 | c->dst.val = *(u32 *)c->dst.ptr; |
038e51de AK |
890 | break; |
891 | case 8: | |
e4e03ded | 892 | c->dst.val = *(u64 *)c->dst.ptr; |
038e51de AK |
893 | break; |
894 | } | |
895 | } | |
896 | break; | |
897 | case DstMem: | |
e4e03ded LV |
898 | if ((c->d & ModRM) && c->modrm_mod == 3) { |
899 | c->dst.type = OP_REG; | |
4e62417b AJ |
900 | break; |
901 | } | |
8b4caf66 LV |
902 | c->dst.type = OP_MEM; |
903 | break; | |
904 | } | |
905 | ||
906 | done: | |
907 | return (rc == X86EMUL_UNHANDLEABLE) ? -1 : 0; | |
908 | } | |
909 | ||
910 | int | |
1be3aa47 | 911 | x86_emulate_insn(struct x86_emulate_ctxt *ctxt, struct x86_emulate_ops *ops) |
8b4caf66 LV |
912 | { |
913 | unsigned long cr2 = ctxt->cr2; | |
914 | int no_wb = 0; | |
915 | u64 msr_data; | |
3427318f | 916 | unsigned long saved_eip = 0; |
8b4caf66 LV |
917 | unsigned long _eflags = ctxt->eflags; |
918 | struct decode_cache *c = &ctxt->decode; | |
1be3aa47 | 919 | int rc = 0; |
8b4caf66 | 920 | |
3427318f LV |
921 | /* Shadow copy of register state. Committed on successful emulation. |
922 | * NOTE: we can copy them from vcpu as x86_decode_insn() doesn't | |
923 | * modify them. | |
924 | */ | |
925 | ||
926 | memcpy(c->regs, ctxt->vcpu->regs, sizeof c->regs); | |
927 | saved_eip = c->eip; | |
928 | ||
8b4caf66 LV |
929 | if ((c->d & ModRM) && (c->modrm_mod != 3)) |
930 | cr2 = c->modrm_ea; | |
931 | ||
932 | if (c->src.type == OP_MEM) { | |
933 | c->src.ptr = (unsigned long *)cr2; | |
934 | c->src.val = 0; | |
935 | if ((rc = ops->read_emulated((unsigned long)c->src.ptr, | |
936 | &c->src.val, | |
937 | c->src.bytes, | |
938 | ctxt->vcpu)) != 0) | |
939 | goto done; | |
940 | c->src.orig_val = c->src.val; | |
941 | } | |
942 | ||
943 | if ((c->d & DstMask) == ImplicitOps) | |
944 | goto special_insn; | |
945 | ||
946 | ||
947 | if (c->dst.type == OP_MEM) { | |
948 | c->dst.ptr = (unsigned long *)cr2; | |
949 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
950 | c->dst.val = 0; | |
e4e03ded LV |
951 | if (c->d & BitOp) { |
952 | unsigned long mask = ~(c->dst.bytes * 8 - 1); | |
df513e2c | 953 | |
e4e03ded LV |
954 | c->dst.ptr = (void *)c->dst.ptr + |
955 | (c->src.val & mask) / 8; | |
038e51de | 956 | } |
e4e03ded LV |
957 | if (!(c->d & Mov) && |
958 | /* optimisation - avoid slow emulated read */ | |
959 | ((rc = ops->read_emulated((unsigned long)c->dst.ptr, | |
960 | &c->dst.val, | |
961 | c->dst.bytes, ctxt->vcpu)) != 0)) | |
038e51de | 962 | goto done; |
038e51de | 963 | } |
e4e03ded | 964 | c->dst.orig_val = c->dst.val; |
038e51de | 965 | |
e4e03ded | 966 | if (c->twobyte) |
6aa8b732 AK |
967 | goto twobyte_insn; |
968 | ||
e4e03ded | 969 | switch (c->b) { |
6aa8b732 AK |
970 | case 0x00 ... 0x05: |
971 | add: /* add */ | |
e4e03ded | 972 | emulate_2op_SrcV("add", c->src, c->dst, _eflags); |
6aa8b732 AK |
973 | break; |
974 | case 0x08 ... 0x0d: | |
975 | or: /* or */ | |
e4e03ded | 976 | emulate_2op_SrcV("or", c->src, c->dst, _eflags); |
6aa8b732 AK |
977 | break; |
978 | case 0x10 ... 0x15: | |
979 | adc: /* adc */ | |
e4e03ded | 980 | emulate_2op_SrcV("adc", c->src, c->dst, _eflags); |
6aa8b732 AK |
981 | break; |
982 | case 0x18 ... 0x1d: | |
983 | sbb: /* sbb */ | |
e4e03ded | 984 | emulate_2op_SrcV("sbb", c->src, c->dst, _eflags); |
6aa8b732 | 985 | break; |
19eb938e | 986 | case 0x20 ... 0x23: |
6aa8b732 | 987 | and: /* and */ |
e4e03ded | 988 | emulate_2op_SrcV("and", c->src, c->dst, _eflags); |
6aa8b732 | 989 | break; |
19eb938e | 990 | case 0x24: /* and al imm8 */ |
e4e03ded LV |
991 | c->dst.type = OP_REG; |
992 | c->dst.ptr = &c->regs[VCPU_REGS_RAX]; | |
993 | c->dst.val = *(u8 *)c->dst.ptr; | |
994 | c->dst.bytes = 1; | |
995 | c->dst.orig_val = c->dst.val; | |
19eb938e NK |
996 | goto and; |
997 | case 0x25: /* and ax imm16, or eax imm32 */ | |
e4e03ded LV |
998 | c->dst.type = OP_REG; |
999 | c->dst.bytes = c->op_bytes; | |
1000 | c->dst.ptr = &c->regs[VCPU_REGS_RAX]; | |
1001 | if (c->op_bytes == 2) | |
1002 | c->dst.val = *(u16 *)c->dst.ptr; | |
19eb938e | 1003 | else |
e4e03ded LV |
1004 | c->dst.val = *(u32 *)c->dst.ptr; |
1005 | c->dst.orig_val = c->dst.val; | |
19eb938e | 1006 | goto and; |
6aa8b732 AK |
1007 | case 0x28 ... 0x2d: |
1008 | sub: /* sub */ | |
e4e03ded | 1009 | emulate_2op_SrcV("sub", c->src, c->dst, _eflags); |
6aa8b732 AK |
1010 | break; |
1011 | case 0x30 ... 0x35: | |
1012 | xor: /* xor */ | |
e4e03ded | 1013 | emulate_2op_SrcV("xor", c->src, c->dst, _eflags); |
6aa8b732 AK |
1014 | break; |
1015 | case 0x38 ... 0x3d: | |
1016 | cmp: /* cmp */ | |
e4e03ded | 1017 | emulate_2op_SrcV("cmp", c->src, c->dst, _eflags); |
6aa8b732 AK |
1018 | break; |
1019 | case 0x63: /* movsxd */ | |
8b4caf66 | 1020 | if (ctxt->mode != X86EMUL_MODE_PROT64) |
6aa8b732 | 1021 | goto cannot_emulate; |
e4e03ded | 1022 | c->dst.val = (s32) c->src.val; |
6aa8b732 AK |
1023 | break; |
1024 | case 0x80 ... 0x83: /* Grp1 */ | |
e4e03ded | 1025 | switch (c->modrm_reg) { |
6aa8b732 AK |
1026 | case 0: |
1027 | goto add; | |
1028 | case 1: | |
1029 | goto or; | |
1030 | case 2: | |
1031 | goto adc; | |
1032 | case 3: | |
1033 | goto sbb; | |
1034 | case 4: | |
1035 | goto and; | |
1036 | case 5: | |
1037 | goto sub; | |
1038 | case 6: | |
1039 | goto xor; | |
1040 | case 7: | |
1041 | goto cmp; | |
1042 | } | |
1043 | break; | |
1044 | case 0x84 ... 0x85: | |
1045 | test: /* test */ | |
e4e03ded | 1046 | emulate_2op_SrcV("test", c->src, c->dst, _eflags); |
6aa8b732 AK |
1047 | break; |
1048 | case 0x86 ... 0x87: /* xchg */ | |
1049 | /* Write back the register source. */ | |
e4e03ded | 1050 | switch (c->dst.bytes) { |
6aa8b732 | 1051 | case 1: |
e4e03ded | 1052 | *(u8 *) c->src.ptr = (u8) c->dst.val; |
6aa8b732 AK |
1053 | break; |
1054 | case 2: | |
e4e03ded | 1055 | *(u16 *) c->src.ptr = (u16) c->dst.val; |
6aa8b732 AK |
1056 | break; |
1057 | case 4: | |
e4e03ded | 1058 | *c->src.ptr = (u32) c->dst.val; |
6aa8b732 AK |
1059 | break; /* 64b reg: zero-extend */ |
1060 | case 8: | |
e4e03ded | 1061 | *c->src.ptr = c->dst.val; |
6aa8b732 AK |
1062 | break; |
1063 | } | |
1064 | /* | |
1065 | * Write back the memory destination with implicit LOCK | |
1066 | * prefix. | |
1067 | */ | |
e4e03ded LV |
1068 | c->dst.val = c->src.val; |
1069 | c->lock_prefix = 1; | |
6aa8b732 | 1070 | break; |
6aa8b732 | 1071 | case 0x88 ... 0x8b: /* mov */ |
7de75248 | 1072 | goto mov; |
7e0b54b1 | 1073 | case 0x8d: /* lea r16/r32, m */ |
e4e03ded | 1074 | c->dst.val = c->modrm_val; |
7e0b54b1 | 1075 | break; |
6aa8b732 AK |
1076 | case 0x8f: /* pop (sole member of Grp1a) */ |
1077 | /* 64-bit mode: POP always pops a 64-bit operand. */ | |
8b4caf66 | 1078 | if (ctxt->mode == X86EMUL_MODE_PROT64) |
e4e03ded LV |
1079 | c->dst.bytes = 8; |
1080 | if ((rc = ops->read_std(register_address( | |
1081 | ctxt->ss_base, | |
1082 | c->regs[VCPU_REGS_RSP]), | |
1083 | &c->dst.val, | |
1084 | c->dst.bytes, | |
1085 | ctxt->vcpu)) != 0) | |
6aa8b732 | 1086 | goto done; |
e4e03ded LV |
1087 | register_address_increment(c->regs[VCPU_REGS_RSP], |
1088 | c->dst.bytes); | |
6aa8b732 | 1089 | break; |
7de75248 | 1090 | case 0xa0 ... 0xa1: /* mov */ |
e4e03ded LV |
1091 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; |
1092 | c->dst.val = c->src.val; | |
1093 | /* skip src displacement */ | |
1094 | c->eip += c->ad_bytes; | |
7de75248 NK |
1095 | break; |
1096 | case 0xa2 ... 0xa3: /* mov */ | |
e4e03ded LV |
1097 | c->dst.val = (unsigned long)c->regs[VCPU_REGS_RAX]; |
1098 | /* skip c->dst displacement */ | |
1099 | c->eip += c->ad_bytes; | |
7de75248 | 1100 | break; |
6aa8b732 AK |
1101 | case 0xc0 ... 0xc1: |
1102 | grp2: /* Grp2 */ | |
e4e03ded | 1103 | switch (c->modrm_reg) { |
6aa8b732 | 1104 | case 0: /* rol */ |
e4e03ded | 1105 | emulate_2op_SrcB("rol", c->src, c->dst, _eflags); |
6aa8b732 AK |
1106 | break; |
1107 | case 1: /* ror */ | |
e4e03ded | 1108 | emulate_2op_SrcB("ror", c->src, c->dst, _eflags); |
6aa8b732 AK |
1109 | break; |
1110 | case 2: /* rcl */ | |
e4e03ded | 1111 | emulate_2op_SrcB("rcl", c->src, c->dst, _eflags); |
6aa8b732 AK |
1112 | break; |
1113 | case 3: /* rcr */ | |
e4e03ded | 1114 | emulate_2op_SrcB("rcr", c->src, c->dst, _eflags); |
6aa8b732 AK |
1115 | break; |
1116 | case 4: /* sal/shl */ | |
1117 | case 6: /* sal/shl */ | |
e4e03ded | 1118 | emulate_2op_SrcB("sal", c->src, c->dst, _eflags); |
6aa8b732 AK |
1119 | break; |
1120 | case 5: /* shr */ | |
e4e03ded | 1121 | emulate_2op_SrcB("shr", c->src, c->dst, _eflags); |
6aa8b732 AK |
1122 | break; |
1123 | case 7: /* sar */ | |
e4e03ded | 1124 | emulate_2op_SrcB("sar", c->src, c->dst, _eflags); |
6aa8b732 AK |
1125 | break; |
1126 | } | |
1127 | break; | |
7de75248 NK |
1128 | case 0xc6 ... 0xc7: /* mov (sole member of Grp11) */ |
1129 | mov: | |
e4e03ded | 1130 | c->dst.val = c->src.val; |
7de75248 | 1131 | break; |
6aa8b732 | 1132 | case 0xd0 ... 0xd1: /* Grp2 */ |
e4e03ded | 1133 | c->src.val = 1; |
6aa8b732 AK |
1134 | goto grp2; |
1135 | case 0xd2 ... 0xd3: /* Grp2 */ | |
e4e03ded | 1136 | c->src.val = c->regs[VCPU_REGS_RCX]; |
6aa8b732 AK |
1137 | goto grp2; |
1138 | case 0xf6 ... 0xf7: /* Grp3 */ | |
e4e03ded | 1139 | switch (c->modrm_reg) { |
6aa8b732 AK |
1140 | case 0 ... 1: /* test */ |
1141 | /* | |
1142 | * Special case in Grp3: test has an immediate | |
1143 | * source operand. | |
1144 | */ | |
e4e03ded LV |
1145 | c->src.type = OP_IMM; |
1146 | c->src.ptr = (unsigned long *)c->eip; | |
1147 | c->src.bytes = (c->d & ByteOp) ? 1 : | |
1148 | c->op_bytes; | |
1149 | if (c->src.bytes == 8) | |
1150 | c->src.bytes = 4; | |
1151 | switch (c->src.bytes) { | |
6aa8b732 | 1152 | case 1: |
e4e03ded | 1153 | c->src.val = insn_fetch(s8, 1, c->eip); |
6aa8b732 AK |
1154 | break; |
1155 | case 2: | |
e4e03ded | 1156 | c->src.val = insn_fetch(s16, 2, c->eip); |
6aa8b732 AK |
1157 | break; |
1158 | case 4: | |
e4e03ded | 1159 | c->src.val = insn_fetch(s32, 4, c->eip); |
6aa8b732 AK |
1160 | break; |
1161 | } | |
1162 | goto test; | |
1163 | case 2: /* not */ | |
e4e03ded | 1164 | c->dst.val = ~c->dst.val; |
6aa8b732 AK |
1165 | break; |
1166 | case 3: /* neg */ | |
e4e03ded | 1167 | emulate_1op("neg", c->dst, _eflags); |
6aa8b732 AK |
1168 | break; |
1169 | default: | |
1170 | goto cannot_emulate; | |
1171 | } | |
1172 | break; | |
1173 | case 0xfe ... 0xff: /* Grp4/Grp5 */ | |
e4e03ded | 1174 | switch (c->modrm_reg) { |
6aa8b732 | 1175 | case 0: /* inc */ |
e4e03ded | 1176 | emulate_1op("inc", c->dst, _eflags); |
6aa8b732 AK |
1177 | break; |
1178 | case 1: /* dec */ | |
e4e03ded | 1179 | emulate_1op("dec", c->dst, _eflags); |
6aa8b732 | 1180 | break; |
26a3e983 | 1181 | case 4: /* jmp abs */ |
e4e03ded LV |
1182 | if (c->b == 0xff) |
1183 | c->eip = c->dst.val; | |
26a3e983 NK |
1184 | else |
1185 | goto cannot_emulate; | |
1186 | break; | |
6aa8b732 AK |
1187 | case 6: /* push */ |
1188 | /* 64-bit mode: PUSH always pushes a 64-bit operand. */ | |
8b4caf66 | 1189 | if (ctxt->mode == X86EMUL_MODE_PROT64) { |
e4e03ded LV |
1190 | c->dst.bytes = 8; |
1191 | if ((rc = ops->read_std( | |
1192 | (unsigned long)c->dst.ptr, | |
1193 | &c->dst.val, 8, | |
1194 | ctxt->vcpu)) != 0) | |
6aa8b732 AK |
1195 | goto done; |
1196 | } | |
e4e03ded LV |
1197 | register_address_increment(c->regs[VCPU_REGS_RSP], |
1198 | -c->dst.bytes); | |
00b2ef47 | 1199 | if ((rc = ops->write_emulated( |
6aa8b732 | 1200 | register_address(ctxt->ss_base, |
e4e03ded LV |
1201 | c->regs[VCPU_REGS_RSP]), |
1202 | &c->dst.val, | |
1203 | c->dst.bytes, ctxt->vcpu)) != 0) | |
6aa8b732 | 1204 | goto done; |
02c03a32 | 1205 | no_wb = 1; |
6aa8b732 AK |
1206 | break; |
1207 | default: | |
1208 | goto cannot_emulate; | |
1209 | } | |
1210 | break; | |
1211 | } | |
1212 | ||
1213 | writeback: | |
02c03a32 | 1214 | if (!no_wb) { |
e4e03ded | 1215 | switch (c->dst.type) { |
6aa8b732 | 1216 | case OP_REG: |
e4e03ded LV |
1217 | /* The 4-byte case *is* correct: |
1218 | * in 64-bit mode we zero-extend. | |
1219 | */ | |
1220 | switch (c->dst.bytes) { | |
6aa8b732 | 1221 | case 1: |
e4e03ded | 1222 | *(u8 *)c->dst.ptr = (u8)c->dst.val; |
6aa8b732 AK |
1223 | break; |
1224 | case 2: | |
e4e03ded | 1225 | *(u16 *)c->dst.ptr = (u16)c->dst.val; |
6aa8b732 AK |
1226 | break; |
1227 | case 4: | |
e4e03ded | 1228 | *c->dst.ptr = (u32)c->dst.val; |
6aa8b732 AK |
1229 | break; /* 64b: zero-ext */ |
1230 | case 8: | |
e4e03ded | 1231 | *c->dst.ptr = c->dst.val; |
6aa8b732 AK |
1232 | break; |
1233 | } | |
1234 | break; | |
1235 | case OP_MEM: | |
e4e03ded LV |
1236 | if (c->lock_prefix) |
1237 | rc = ops->cmpxchg_emulated( | |
1238 | (unsigned long)c->dst.ptr, | |
1239 | &c->dst.orig_val, | |
1240 | &c->dst.val, | |
1241 | c->dst.bytes, | |
1242 | ctxt->vcpu); | |
6aa8b732 | 1243 | else |
e4e03ded LV |
1244 | rc = ops->write_emulated( |
1245 | (unsigned long)c->dst.ptr, | |
1246 | &c->dst.val, | |
1247 | c->dst.bytes, | |
1248 | ctxt->vcpu); | |
6aa8b732 AK |
1249 | if (rc != 0) |
1250 | goto done; | |
1251 | default: | |
1252 | break; | |
1253 | } | |
1254 | } | |
1255 | ||
1256 | /* Commit shadow register state. */ | |
e4e03ded | 1257 | memcpy(ctxt->vcpu->regs, c->regs, sizeof c->regs); |
6aa8b732 | 1258 | ctxt->eflags = _eflags; |
e4e03ded | 1259 | ctxt->vcpu->rip = c->eip; |
6aa8b732 AK |
1260 | |
1261 | done: | |
3427318f LV |
1262 | if (rc == X86EMUL_UNHANDLEABLE) { |
1263 | c->eip = saved_eip; | |
1264 | return -1; | |
1265 | } | |
1266 | return 0; | |
6aa8b732 AK |
1267 | |
1268 | special_insn: | |
e4e03ded | 1269 | if (c->twobyte) |
6aa8b732 | 1270 | goto twobyte_special_insn; |
e4e03ded | 1271 | switch (c->b) { |
7e778161 | 1272 | case 0x50 ... 0x57: /* push reg */ |
e4e03ded LV |
1273 | if (c->op_bytes == 2) |
1274 | c->src.val = (u16) c->regs[c->b & 0x7]; | |
7e778161 | 1275 | else |
e4e03ded LV |
1276 | c->src.val = (u32) c->regs[c->b & 0x7]; |
1277 | c->dst.type = OP_MEM; | |
1278 | c->dst.bytes = c->op_bytes; | |
1279 | c->dst.val = c->src.val; | |
1280 | register_address_increment(c->regs[VCPU_REGS_RSP], | |
1281 | -c->op_bytes); | |
1282 | c->dst.ptr = (void *) register_address( | |
1283 | ctxt->ss_base, c->regs[VCPU_REGS_RSP]); | |
7e778161 | 1284 | break; |
7de75248 | 1285 | case 0x58 ... 0x5f: /* pop reg */ |
e4e03ded LV |
1286 | c->dst.ptr = |
1287 | (unsigned long *)&c->regs[c->b & 0x7]; | |
7de75248 NK |
1288 | pop_instruction: |
1289 | if ((rc = ops->read_std(register_address(ctxt->ss_base, | |
e4e03ded LV |
1290 | c->regs[VCPU_REGS_RSP]), c->dst.ptr, |
1291 | c->op_bytes, ctxt->vcpu)) != 0) | |
7de75248 NK |
1292 | goto done; |
1293 | ||
e4e03ded LV |
1294 | register_address_increment(c->regs[VCPU_REGS_RSP], |
1295 | c->op_bytes); | |
7de75248 NK |
1296 | no_wb = 1; /* Disable writeback. */ |
1297 | break; | |
1e35d3c4 | 1298 | case 0x6a: /* push imm8 */ |
e4e03ded LV |
1299 | c->src.val = 0L; |
1300 | c->src.val = insn_fetch(s8, 1, c->eip); | |
1301 | push: | |
1302 | c->dst.type = OP_MEM; | |
1303 | c->dst.bytes = c->op_bytes; | |
1304 | c->dst.val = c->src.val; | |
1305 | register_address_increment(c->regs[VCPU_REGS_RSP], | |
1306 | -c->op_bytes); | |
1307 | c->dst.ptr = (void *) register_address(ctxt->ss_base, | |
1308 | c->regs[VCPU_REGS_RSP]); | |
1e35d3c4 | 1309 | break; |
e70669ab LV |
1310 | case 0x6c: /* insb */ |
1311 | case 0x6d: /* insw/insd */ | |
3090dd73 | 1312 | if (kvm_emulate_pio_string(ctxt->vcpu, NULL, |
e4e03ded LV |
1313 | 1, |
1314 | (c->d & ByteOp) ? 1 : c->op_bytes, | |
1315 | c->rep_prefix ? | |
1316 | address_mask(c->regs[VCPU_REGS_RCX]) : 1, | |
1317 | (_eflags & EFLG_DF), | |
e70669ab | 1318 | register_address(ctxt->es_base, |
e4e03ded LV |
1319 | c->regs[VCPU_REGS_RDI]), |
1320 | c->rep_prefix, | |
3427318f LV |
1321 | c->regs[VCPU_REGS_RDX]) == 0) { |
1322 | c->eip = saved_eip; | |
e70669ab | 1323 | return -1; |
3427318f | 1324 | } |
e70669ab LV |
1325 | return 0; |
1326 | case 0x6e: /* outsb */ | |
1327 | case 0x6f: /* outsw/outsd */ | |
3090dd73 | 1328 | if (kvm_emulate_pio_string(ctxt->vcpu, NULL, |
e4e03ded LV |
1329 | 0, |
1330 | (c->d & ByteOp) ? 1 : c->op_bytes, | |
1331 | c->rep_prefix ? | |
1332 | address_mask(c->regs[VCPU_REGS_RCX]) : 1, | |
1333 | (_eflags & EFLG_DF), | |
1334 | register_address(c->override_base ? | |
1335 | *c->override_base : | |
1336 | ctxt->ds_base, | |
1337 | c->regs[VCPU_REGS_RSI]), | |
1338 | c->rep_prefix, | |
3427318f LV |
1339 | c->regs[VCPU_REGS_RDX]) == 0) { |
1340 | c->eip = saved_eip; | |
e70669ab | 1341 | return -1; |
3427318f | 1342 | } |
e70669ab | 1343 | return 0; |
55bebde4 | 1344 | case 0x70 ... 0x7f: /* jcc (short) */ { |
e4e03ded | 1345 | int rel = insn_fetch(s8, 1, c->eip); |
55bebde4 | 1346 | |
e4e03ded | 1347 | if (test_cc(c->b, _eflags)) |
55bebde4 NK |
1348 | JMP_REL(rel); |
1349 | break; | |
1350 | } | |
fd2a7608 | 1351 | case 0x9c: /* pushf */ |
e4e03ded | 1352 | c->src.val = (unsigned long) _eflags; |
fd2a7608 | 1353 | goto push; |
535eabcf | 1354 | case 0x9d: /* popf */ |
e4e03ded | 1355 | c->dst.ptr = (unsigned long *) &_eflags; |
535eabcf | 1356 | goto pop_instruction; |
7de75248 | 1357 | case 0xc3: /* ret */ |
e4e03ded | 1358 | c->dst.ptr = &c->eip; |
7de75248 NK |
1359 | goto pop_instruction; |
1360 | case 0xf4: /* hlt */ | |
1361 | ctxt->vcpu->halt_request = 1; | |
1362 | goto done; | |
e70669ab | 1363 | } |
e4e03ded LV |
1364 | if (c->rep_prefix) { |
1365 | if (c->regs[VCPU_REGS_RCX] == 0) { | |
1366 | ctxt->vcpu->rip = c->eip; | |
6aa8b732 AK |
1367 | goto done; |
1368 | } | |
e4e03ded LV |
1369 | c->regs[VCPU_REGS_RCX]--; |
1370 | c->eip = ctxt->vcpu->rip; | |
6aa8b732 | 1371 | } |
e4e03ded | 1372 | switch (c->b) { |
6aa8b732 | 1373 | case 0xa4 ... 0xa5: /* movs */ |
e4e03ded LV |
1374 | c->dst.type = OP_MEM; |
1375 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1376 | c->dst.ptr = (unsigned long *)register_address( | |
1377 | ctxt->es_base, | |
1378 | c->regs[VCPU_REGS_RDI]); | |
6aa8b732 | 1379 | if ((rc = ops->read_emulated(register_address( |
e4e03ded LV |
1380 | c->override_base ? *c->override_base : |
1381 | ctxt->ds_base, | |
1382 | c->regs[VCPU_REGS_RSI]), | |
1383 | &c->dst.val, | |
1384 | c->dst.bytes, ctxt->vcpu)) != 0) | |
6aa8b732 | 1385 | goto done; |
e4e03ded LV |
1386 | register_address_increment(c->regs[VCPU_REGS_RSI], |
1387 | (_eflags & EFLG_DF) ? -c->dst.bytes | |
1388 | : c->dst.bytes); | |
1389 | register_address_increment(c->regs[VCPU_REGS_RDI], | |
1390 | (_eflags & EFLG_DF) ? -c->dst.bytes | |
1391 | : c->dst.bytes); | |
6aa8b732 AK |
1392 | break; |
1393 | case 0xa6 ... 0xa7: /* cmps */ | |
1394 | DPRINTF("Urk! I don't handle CMPS.\n"); | |
1395 | goto cannot_emulate; | |
1396 | case 0xaa ... 0xab: /* stos */ | |
e4e03ded LV |
1397 | c->dst.type = OP_MEM; |
1398 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1399 | c->dst.ptr = (unsigned long *)cr2; | |
1400 | c->dst.val = c->regs[VCPU_REGS_RAX]; | |
1401 | register_address_increment(c->regs[VCPU_REGS_RDI], | |
1402 | (_eflags & EFLG_DF) ? -c->dst.bytes | |
1403 | : c->dst.bytes); | |
6aa8b732 AK |
1404 | break; |
1405 | case 0xac ... 0xad: /* lods */ | |
e4e03ded LV |
1406 | c->dst.type = OP_REG; |
1407 | c->dst.bytes = (c->d & ByteOp) ? 1 : c->op_bytes; | |
1408 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
1409 | if ((rc = ops->read_emulated(cr2, &c->dst.val, | |
1410 | c->dst.bytes, | |
cebff02b | 1411 | ctxt->vcpu)) != 0) |
6aa8b732 | 1412 | goto done; |
e4e03ded LV |
1413 | register_address_increment(c->regs[VCPU_REGS_RSI], |
1414 | (_eflags & EFLG_DF) ? -c->dst.bytes | |
1415 | : c->dst.bytes); | |
6aa8b732 AK |
1416 | break; |
1417 | case 0xae ... 0xaf: /* scas */ | |
1418 | DPRINTF("Urk! I don't handle SCAS.\n"); | |
1419 | goto cannot_emulate; | |
1a52e051 NK |
1420 | case 0xe8: /* call (near) */ { |
1421 | long int rel; | |
e4e03ded | 1422 | switch (c->op_bytes) { |
1a52e051 | 1423 | case 2: |
e4e03ded | 1424 | rel = insn_fetch(s16, 2, c->eip); |
1a52e051 NK |
1425 | break; |
1426 | case 4: | |
e4e03ded | 1427 | rel = insn_fetch(s32, 4, c->eip); |
1a52e051 NK |
1428 | break; |
1429 | case 8: | |
e4e03ded | 1430 | rel = insn_fetch(s64, 8, c->eip); |
1a52e051 NK |
1431 | break; |
1432 | default: | |
1433 | DPRINTF("Call: Invalid op_bytes\n"); | |
1434 | goto cannot_emulate; | |
1435 | } | |
e4e03ded | 1436 | c->src.val = (unsigned long) c->eip; |
1a52e051 | 1437 | JMP_REL(rel); |
e4e03ded | 1438 | c->op_bytes = c->ad_bytes; |
1a52e051 NK |
1439 | goto push; |
1440 | } | |
1441 | case 0xe9: /* jmp rel */ | |
1442 | case 0xeb: /* jmp rel short */ | |
e4e03ded | 1443 | JMP_REL(c->src.val); |
1a52e051 NK |
1444 | no_wb = 1; /* Disable writeback. */ |
1445 | break; | |
1446 | ||
7f0aaee0 | 1447 | |
6aa8b732 AK |
1448 | } |
1449 | goto writeback; | |
1450 | ||
1451 | twobyte_insn: | |
e4e03ded | 1452 | switch (c->b) { |
6aa8b732 | 1453 | case 0x01: /* lgdt, lidt, lmsw */ |
d37c8557 AJ |
1454 | /* Disable writeback. */ |
1455 | no_wb = 1; | |
e4e03ded | 1456 | switch (c->modrm_reg) { |
6aa8b732 AK |
1457 | u16 size; |
1458 | unsigned long address; | |
1459 | ||
aca7f966 | 1460 | case 0: /* vmcall */ |
e4e03ded | 1461 | if (c->modrm_mod != 3 || c->modrm_rm != 1) |
aca7f966 AL |
1462 | goto cannot_emulate; |
1463 | ||
7aa81cc0 AL |
1464 | rc = kvm_fix_hypercall(ctxt->vcpu); |
1465 | if (rc) | |
1466 | goto done; | |
1467 | ||
1468 | kvm_emulate_hypercall(ctxt->vcpu); | |
aca7f966 | 1469 | break; |
6aa8b732 | 1470 | case 2: /* lgdt */ |
e4e03ded LV |
1471 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
1472 | &size, &address, c->op_bytes); | |
6aa8b732 AK |
1473 | if (rc) |
1474 | goto done; | |
1475 | realmode_lgdt(ctxt->vcpu, size, address); | |
1476 | break; | |
aca7f966 | 1477 | case 3: /* lidt/vmmcall */ |
e4e03ded | 1478 | if (c->modrm_mod == 3 && c->modrm_rm == 1) { |
7aa81cc0 AL |
1479 | rc = kvm_fix_hypercall(ctxt->vcpu); |
1480 | if (rc) | |
1481 | goto done; | |
1482 | kvm_emulate_hypercall(ctxt->vcpu); | |
aca7f966 | 1483 | } else { |
e4e03ded | 1484 | rc = read_descriptor(ctxt, ops, c->src.ptr, |
aca7f966 | 1485 | &size, &address, |
e4e03ded | 1486 | c->op_bytes); |
aca7f966 AL |
1487 | if (rc) |
1488 | goto done; | |
1489 | realmode_lidt(ctxt->vcpu, size, address); | |
1490 | } | |
6aa8b732 AK |
1491 | break; |
1492 | case 4: /* smsw */ | |
e4e03ded | 1493 | if (c->modrm_mod != 3) |
6aa8b732 | 1494 | goto cannot_emulate; |
e4e03ded | 1495 | *(u16 *)&c->regs[c->modrm_rm] |
6aa8b732 AK |
1496 | = realmode_get_cr(ctxt->vcpu, 0); |
1497 | break; | |
1498 | case 6: /* lmsw */ | |
e4e03ded | 1499 | if (c->modrm_mod != 3) |
6aa8b732 | 1500 | goto cannot_emulate; |
e4e03ded | 1501 | realmode_lmsw(ctxt->vcpu, (u16)c->modrm_val, &_eflags); |
6aa8b732 AK |
1502 | break; |
1503 | case 7: /* invlpg*/ | |
1504 | emulate_invlpg(ctxt->vcpu, cr2); | |
1505 | break; | |
1506 | default: | |
1507 | goto cannot_emulate; | |
1508 | } | |
1509 | break; | |
1510 | case 0x21: /* mov from dr to reg */ | |
bac27d35 | 1511 | no_wb = 1; |
e4e03ded | 1512 | if (c->modrm_mod != 3) |
6aa8b732 | 1513 | goto cannot_emulate; |
e4e03ded LV |
1514 | rc = emulator_get_dr(ctxt, c->modrm_reg, |
1515 | &c->regs[c->modrm_rm]); | |
6aa8b732 AK |
1516 | break; |
1517 | case 0x23: /* mov from reg to dr */ | |
bac27d35 | 1518 | no_wb = 1; |
e4e03ded | 1519 | if (c->modrm_mod != 3) |
6aa8b732 | 1520 | goto cannot_emulate; |
e4e03ded LV |
1521 | rc = emulator_set_dr(ctxt, c->modrm_reg, |
1522 | c->regs[c->modrm_rm]); | |
6aa8b732 AK |
1523 | break; |
1524 | case 0x40 ... 0x4f: /* cmov */ | |
e4e03ded | 1525 | c->dst.val = c->dst.orig_val = c->src.val; |
e3243452 | 1526 | no_wb = 1; |
6aa8b732 AK |
1527 | /* |
1528 | * First, assume we're decoding an even cmov opcode | |
1529 | * (lsb == 0). | |
1530 | */ | |
e4e03ded | 1531 | switch ((c->b & 15) >> 1) { |
6aa8b732 | 1532 | case 0: /* cmovo */ |
e3243452 | 1533 | no_wb = (_eflags & EFLG_OF) ? 0 : 1; |
6aa8b732 AK |
1534 | break; |
1535 | case 1: /* cmovb/cmovc/cmovnae */ | |
e3243452 | 1536 | no_wb = (_eflags & EFLG_CF) ? 0 : 1; |
6aa8b732 AK |
1537 | break; |
1538 | case 2: /* cmovz/cmove */ | |
e3243452 | 1539 | no_wb = (_eflags & EFLG_ZF) ? 0 : 1; |
6aa8b732 AK |
1540 | break; |
1541 | case 3: /* cmovbe/cmovna */ | |
e3243452 | 1542 | no_wb = (_eflags & (EFLG_CF | EFLG_ZF)) ? 0 : 1; |
6aa8b732 AK |
1543 | break; |
1544 | case 4: /* cmovs */ | |
e3243452 | 1545 | no_wb = (_eflags & EFLG_SF) ? 0 : 1; |
6aa8b732 AK |
1546 | break; |
1547 | case 5: /* cmovp/cmovpe */ | |
e3243452 | 1548 | no_wb = (_eflags & EFLG_PF) ? 0 : 1; |
6aa8b732 AK |
1549 | break; |
1550 | case 7: /* cmovle/cmovng */ | |
e3243452 | 1551 | no_wb = (_eflags & EFLG_ZF) ? 0 : 1; |
6aa8b732 AK |
1552 | /* fall through */ |
1553 | case 6: /* cmovl/cmovnge */ | |
e3243452 AK |
1554 | no_wb &= (!(_eflags & EFLG_SF) != |
1555 | !(_eflags & EFLG_OF)) ? 0 : 1; | |
6aa8b732 AK |
1556 | break; |
1557 | } | |
1558 | /* Odd cmov opcodes (lsb == 1) have inverted sense. */ | |
e4e03ded | 1559 | no_wb ^= c->b & 1; |
6aa8b732 | 1560 | break; |
7de75248 NK |
1561 | case 0xa3: |
1562 | bt: /* bt */ | |
e4e03ded LV |
1563 | /* only subword offset */ |
1564 | c->src.val &= (c->dst.bytes << 3) - 1; | |
1565 | emulate_2op_SrcV_nobyte("bt", c->src, c->dst, _eflags); | |
7de75248 NK |
1566 | break; |
1567 | case 0xab: | |
1568 | bts: /* bts */ | |
e4e03ded LV |
1569 | /* only subword offset */ |
1570 | c->src.val &= (c->dst.bytes << 3) - 1; | |
1571 | emulate_2op_SrcV_nobyte("bts", c->src, c->dst, _eflags); | |
7de75248 | 1572 | break; |
6aa8b732 AK |
1573 | case 0xb0 ... 0xb1: /* cmpxchg */ |
1574 | /* | |
1575 | * Save real source value, then compare EAX against | |
1576 | * destination. | |
1577 | */ | |
e4e03ded LV |
1578 | c->src.orig_val = c->src.val; |
1579 | c->src.val = c->regs[VCPU_REGS_RAX]; | |
1580 | emulate_2op_SrcV("cmp", c->src, c->dst, _eflags); | |
6aa8b732 AK |
1581 | if (_eflags & EFLG_ZF) { |
1582 | /* Success: write back to memory. */ | |
e4e03ded | 1583 | c->dst.val = c->src.orig_val; |
6aa8b732 AK |
1584 | } else { |
1585 | /* Failure: write the value we saw to EAX. */ | |
e4e03ded LV |
1586 | c->dst.type = OP_REG; |
1587 | c->dst.ptr = (unsigned long *)&c->regs[VCPU_REGS_RAX]; | |
6aa8b732 AK |
1588 | } |
1589 | break; | |
6aa8b732 AK |
1590 | case 0xb3: |
1591 | btr: /* btr */ | |
e4e03ded LV |
1592 | /* only subword offset */ |
1593 | c->src.val &= (c->dst.bytes << 3) - 1; | |
1594 | emulate_2op_SrcV_nobyte("btr", c->src, c->dst, _eflags); | |
6aa8b732 | 1595 | break; |
6aa8b732 | 1596 | case 0xb6 ... 0xb7: /* movzx */ |
e4e03ded LV |
1597 | c->dst.bytes = c->op_bytes; |
1598 | c->dst.val = (c->d & ByteOp) ? (u8) c->src.val | |
1599 | : (u16) c->src.val; | |
6aa8b732 | 1600 | break; |
6aa8b732 | 1601 | case 0xba: /* Grp8 */ |
e4e03ded | 1602 | switch (c->modrm_reg & 3) { |
6aa8b732 AK |
1603 | case 0: |
1604 | goto bt; | |
1605 | case 1: | |
1606 | goto bts; | |
1607 | case 2: | |
1608 | goto btr; | |
1609 | case 3: | |
1610 | goto btc; | |
1611 | } | |
1612 | break; | |
7de75248 NK |
1613 | case 0xbb: |
1614 | btc: /* btc */ | |
e4e03ded LV |
1615 | /* only subword offset */ |
1616 | c->src.val &= (c->dst.bytes << 3) - 1; | |
1617 | emulate_2op_SrcV_nobyte("btc", c->src, c->dst, _eflags); | |
7de75248 | 1618 | break; |
6aa8b732 | 1619 | case 0xbe ... 0xbf: /* movsx */ |
e4e03ded LV |
1620 | c->dst.bytes = c->op_bytes; |
1621 | c->dst.val = (c->d & ByteOp) ? (s8) c->src.val : | |
1622 | (s16) c->src.val; | |
6aa8b732 | 1623 | break; |
a012e65a | 1624 | case 0xc3: /* movnti */ |
e4e03ded LV |
1625 | c->dst.bytes = c->op_bytes; |
1626 | c->dst.val = (c->op_bytes == 4) ? (u32) c->src.val : | |
1627 | (u64) c->src.val; | |
a012e65a | 1628 | break; |
6aa8b732 AK |
1629 | } |
1630 | goto writeback; | |
1631 | ||
1632 | twobyte_special_insn: | |
1633 | /* Disable writeback. */ | |
02c03a32 | 1634 | no_wb = 1; |
e4e03ded | 1635 | switch (c->b) { |
7de75248 NK |
1636 | case 0x06: |
1637 | emulate_clts(ctxt->vcpu); | |
1638 | break; | |
651a3e29 AK |
1639 | case 0x08: /* invd */ |
1640 | break; | |
687fdbfe AK |
1641 | case 0x09: /* wbinvd */ |
1642 | break; | |
6aa8b732 AK |
1643 | case 0x0d: /* GrpP (prefetch) */ |
1644 | case 0x18: /* Grp16 (prefetch/nop) */ | |
1645 | break; | |
6aa8b732 | 1646 | case 0x20: /* mov cr, reg */ |
e4e03ded | 1647 | if (c->modrm_mod != 3) |
6aa8b732 | 1648 | goto cannot_emulate; |
e4e03ded LV |
1649 | c->regs[c->modrm_rm] = |
1650 | realmode_get_cr(ctxt->vcpu, c->modrm_reg); | |
6aa8b732 AK |
1651 | break; |
1652 | case 0x22: /* mov reg, cr */ | |
e4e03ded | 1653 | if (c->modrm_mod != 3) |
6aa8b732 | 1654 | goto cannot_emulate; |
e4e03ded LV |
1655 | realmode_set_cr(ctxt->vcpu, |
1656 | c->modrm_reg, c->modrm_val, &_eflags); | |
6aa8b732 | 1657 | break; |
35f3f286 AK |
1658 | case 0x30: |
1659 | /* wrmsr */ | |
e4e03ded LV |
1660 | msr_data = (u32)c->regs[VCPU_REGS_RAX] |
1661 | | ((u64)c->regs[VCPU_REGS_RDX] << 32); | |
1662 | rc = kvm_set_msr(ctxt->vcpu, c->regs[VCPU_REGS_RCX], msr_data); | |
35f3f286 | 1663 | if (rc) { |
cbdd1bea | 1664 | kvm_x86_ops->inject_gp(ctxt->vcpu, 0); |
e4e03ded | 1665 | c->eip = ctxt->vcpu->rip; |
35f3f286 AK |
1666 | } |
1667 | rc = X86EMUL_CONTINUE; | |
1668 | break; | |
1669 | case 0x32: | |
1670 | /* rdmsr */ | |
e4e03ded LV |
1671 | rc = kvm_get_msr(ctxt->vcpu, |
1672 | c->regs[VCPU_REGS_RCX], &msr_data); | |
35f3f286 | 1673 | if (rc) { |
cbdd1bea | 1674 | kvm_x86_ops->inject_gp(ctxt->vcpu, 0); |
e4e03ded | 1675 | c->eip = ctxt->vcpu->rip; |
35f3f286 | 1676 | } else { |
e4e03ded LV |
1677 | c->regs[VCPU_REGS_RAX] = (u32)msr_data; |
1678 | c->regs[VCPU_REGS_RDX] = msr_data >> 32; | |
35f3f286 AK |
1679 | } |
1680 | rc = X86EMUL_CONTINUE; | |
1681 | break; | |
bbe9abbd NK |
1682 | case 0x80 ... 0x8f: /* jnz rel, etc*/ { |
1683 | long int rel; | |
1684 | ||
e4e03ded | 1685 | switch (c->op_bytes) { |
bbe9abbd | 1686 | case 2: |
e4e03ded | 1687 | rel = insn_fetch(s16, 2, c->eip); |
bbe9abbd NK |
1688 | break; |
1689 | case 4: | |
e4e03ded | 1690 | rel = insn_fetch(s32, 4, c->eip); |
bbe9abbd NK |
1691 | break; |
1692 | case 8: | |
e4e03ded | 1693 | rel = insn_fetch(s64, 8, c->eip); |
bbe9abbd NK |
1694 | break; |
1695 | default: | |
1696 | DPRINTF("jnz: Invalid op_bytes\n"); | |
1697 | goto cannot_emulate; | |
1698 | } | |
e4e03ded | 1699 | if (test_cc(c->b, _eflags)) |
bbe9abbd NK |
1700 | JMP_REL(rel); |
1701 | break; | |
1702 | } | |
6aa8b732 | 1703 | case 0xc7: /* Grp9 (cmpxchg8b) */ |
6aa8b732 | 1704 | { |
4c690a1e | 1705 | u64 old, new; |
cebff02b LV |
1706 | if ((rc = ops->read_emulated(cr2, &old, 8, ctxt->vcpu)) |
1707 | != 0) | |
6aa8b732 | 1708 | goto done; |
e4e03ded LV |
1709 | if (((u32) (old >> 0) != |
1710 | (u32) c->regs[VCPU_REGS_RAX]) || | |
1711 | ((u32) (old >> 32) != | |
1712 | (u32) c->regs[VCPU_REGS_RDX])) { | |
1713 | c->regs[VCPU_REGS_RAX] = (u32) (old >> 0); | |
1714 | c->regs[VCPU_REGS_RDX] = (u32) (old >> 32); | |
6aa8b732 AK |
1715 | _eflags &= ~EFLG_ZF; |
1716 | } else { | |
e4e03ded LV |
1717 | new = ((u64)c->regs[VCPU_REGS_RCX] << 32) |
1718 | | (u32) c->regs[VCPU_REGS_RBX]; | |
4c690a1e | 1719 | if ((rc = ops->cmpxchg_emulated(cr2, &old, |
cebff02b | 1720 | &new, 8, ctxt->vcpu)) != 0) |
6aa8b732 AK |
1721 | goto done; |
1722 | _eflags |= EFLG_ZF; | |
1723 | } | |
1724 | break; | |
1725 | } | |
6aa8b732 AK |
1726 | } |
1727 | goto writeback; | |
1728 | ||
1729 | cannot_emulate: | |
e4e03ded | 1730 | DPRINTF("Cannot emulate %02x\n", c->b); |
3427318f | 1731 | c->eip = saved_eip; |
6aa8b732 AK |
1732 | return -1; |
1733 | } |